It takes a few minutes for my tankless water heater to warm up, so we end up wasting a lot of water in our shower. Is there a way to avoid this? A friend mentioned a “comfort valve” or something? What is it and how does it work? Or is there another solution? Thx!
I actually did this when I got my tankless. It saved like 6 units of water which was like 600 gallons over the 3 months but I was only like $17 off my bill.
$17 over 3 months isn't worth the work imo but if you're on a water budget or if it costs a lot in your area ymmv.